A tool I find particularly handy for cutting is my 4 1/2" grinders, I have both a hitachi and a dewault, I like the hitachi a little better. I used to have a couple makita's (20 years ago) but they would burn out too quick, I used them for cutting out old mortar. With a dry diamond blade these things can cut through masonry, stone, steel, tile, plastic even wood, though not so good at wood. They make pretty good grinders with that blade too. Not the prettiest work but quick and effective.

yes I went lithium battery. I still would like to pick up a new circular saw because that's really my bread and butter. i have a cordless one and it doesn't have enough power.

id recommend looking for an old industrial one on craigslist. new affordable home depot ones burn out and have no power. unless u dont plan to use it much, or light duty wood only, in which case id recommend the black n decker with the sawdust bag